change validation to exclude classes of tablets from the replication graph checks.
change validation to exclude classes of tablets from the replication graph checks.

fanngyuan/vitess,fanngyuan/vitess,fanngyuan/vitess,nso95/vitess,nso95/vitess,nso95/vitess,nso95/vitess,fanngyuan/vitess,fanngyuan/vitess,nso95/vitess